An electrode assembly processing device, method and electrode assembly

Abstract

The present invention discloses an electrode assembly processing device, method and electrode assembly. The device includes hot-pressing the laminated or wound electrode assembly by using a hot-pressing component; fixing and welding the positive and negative electrode tabs of the electrode assembly during the hot-pressing process by using two sets of welding components. By setting the hot-pressing component and the welding component, the hot-pressing and welding of the electrode assembly are completed by one device. The short-circuit test and ultrasonic welding of the electrode tabs are completed within the process time of hot-pressing, which can effectively shorten the production time, improve the efficiency, reduce the handling times during the production of the battery cell, and improve the yield of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of hot pressing and welding of lithium battery electrode assemblies, and particularly to an electrode assembly processing device, method and electrode assembly. Background Art

[0002] After the lithium-ion battery sheet is manufactured, it needs to be wound or laminated to form an electrode assembly. After the electrode assembly is hot pressed, the tab is then ultrasonically welded. Hot pressing is to make the contact between the electrode sheet and the separator closer, reduce the thickness of the electrode assembly, reduce the internal resistance and ensure the battery performance; tab testing can detect short circuits in the electrode assembly and reduce the failure rate of the electrode assembly; tab ultrasonic welding is to weld the multiple layers of tabs of the electrode assembly together to make the contact between the tabs close, ensure the effect during subsequent laser welding, and avoid tab welding through or explosion points.

[0003] Currently, after the electrode assembly is hot pressed, it needs to be transported to the testing station or the tab ultrasonic welding station manually or by equipment. Hot pressing, testing and ultrasonic welding are carried out at multiple stations, resulting in a large floor area of the equipment, increased costs, increased processes, and an increased risk of damage to the electrode assembly during the transfer process.

[0004] The patent document with the literature number CN217280909U discloses a battery cell hot pressing device. From its solution, it can be seen that the solution uses induction heating to heat the battery cell, which can improve the heating efficiency of the battery cell and ensure good temperature consistency between the inside and the surface of the battery cell during heating, but the solution cannot achieve the welding and testing of the tabs of the battery cell.

[0005] The patent document with the literature number CN220880912U discloses a battery cell tab ultrasonic welding workbench. Its solution welds the tabs of the battery cell and has the advantages of simple structure and strong compatibility, but at the same time, there are also problems that the battery cell cannot be hot pressed and tested. Summary of the Invention

[0006] The purpose of the present invention is to provide an electrode assembly processing device, method and electrode assembly, which can simultaneously complete the hot pressing, welding and testing of the electrode assembly and improve the production efficiency of the electrode assembly.

[0007] The purpose of the present invention can be achieved by the following technical solutions: An electrode assembly processing device, method and electrode assembly, including:

[0008] A hot pressing component for hot pressing the laminated or wound electrode assembly;

[0009] Two groups of welding components for respectively fixing and welding the positive and negative tabs of the electrode assembly during the hot pressing process.

[0010] As a further aspect of the present invention, the hot pressing assembly includes an upper support plate, a lower support plate, and an electric cylinder;

[0011] Among them, the lower support plate is connected with a plurality of guide posts, and the upper support plate is connected with guide sleeves corresponding to the guide posts;

[0012] The top surface of the upper support plate is connected with an electric cylinder, and the upper support plate slides up and down along the plurality of guide posts under the drive of the electric cylinder;

[0013] The bottom surface of the upper support plate is connected with an upper hot pressing plate, and the lower support plate is connected with a lower hot pressing plate. Heating rods are installed in both the upper hot pressing plate and the lower hot pressing plate.

[0014] As a further aspect of the present invention, the hot pressing assembly further includes an upper fixing plate. The upper fixing plate is connected to the upper ends of the plurality of guide posts. The top surface of the upper fixing plate is connected with an electric cylinder, and the telescopic rod of the electric cylinder passes through the upper fixing plate and then is connected to the upper support plate.

[0015] As a further aspect of the present invention, an upper heat insulation plate is connected between the upper support plate and the upper hot pressing plate, and a lower heat insulation plate is connected between the lower support plate and the lower hot pressing plate.

[0016] As a further aspect of the present invention, each welding assembly includes an upper pressing block, a lower pressing block, a welding head, and a welding seat;

[0017] Among them, the upper pressing block is connected to the side of the upper heat insulation plate, the lower pressing block is connected to the side of the lower heat insulation plate, and the upper pressing block corresponds to the lower pressing block. When the hot pressing assembly performs hot pressing on the electrode assembly, the upper pressing block and the lower pressing block jointly squeeze and fix the tab;

[0018] The welding seat is connected to the lower support plate, and the welding head is connected to the welding machine; after the tab is squeezed and fixed by the upper pressing block and the lower pressing block, the tab is placed on the welding seat, and the welding head welds the tab.

[0019] As a further aspect of the present invention, the welding head is connected to a telescopic seat, the telescopic seat is connected to a telescopic shaft, and the telescopic shaft is connected to the welding machine;

[0020] Among them, the welding machine realizes the horizontal expansion and contraction of the telescopic seat and the welding head by using the telescopic shaft, and the welding machine realizes the vertical expansion and contraction of the welding head by using the telescopic seat;

[0021] When the tab is squeezed by the upper pressing block and the lower pressing block, the welding head is in a retracted state both horizontally and vertically;

[0022] After the tab is squeezed and fixed by the upper pressing block and the lower pressing block, the tab is placed on the welding seat, and the welding head is in an extended state both horizontally and vertically to weld the tab.

[0023] As a further aspect of the present invention, the upper pressing block is provided with a stepped through hole in the vertical direction. A probe rod is arranged in the stepped through hole, and the lower end of the probe rod is connected with a probe foot;

[0024] The large-diameter section of the stepped through-hole is located on the lower side and the small-diameter section is located on the upper side. A spring is arranged in the large-diameter section. The spring is located between the stepped surface and the probe pin and sleeved on the probe rod.

[0025] An electrode assembly processing method using the above device includes the steps:

[0026] S1. Preheat the lower hot pressing plate and the upper hot pressing plate to 90°C - 110°C. Place the stacked or wound electrode assembly on the lower hot pressing plate. The positive and negative electrode tabs of the electrode assembly are respectively located above the two lower pressing blocks on both sides;

[0027] S2. Use the electric cylinder to control the descent of the upper hot pressing plate to hot press the electrode assembly. The upper hot pressing plate and the lower hot pressing plate continuously apply pressure until the pressure value reaches 5 - 10T and then maintain for 90 - 150S;

[0028] S3. The positive and negative electrode tabs are in a compressed state between the upper pressing block and the lower pressing block and placed on the welding seat. Use the welding head to perform ultrasonic welding on the electrode tabs;

[0029] S4. After welding is completed and the hot pressing time reaches the process setting value, the upper hot pressing plate rises, completing the hot pressing and electrode tab welding of the electrode assembly, and sending it to the next process.

[0030] As a further solution of the present invention, when the upper hot pressing plate descends to hot press the electrode assembly in S2, the probe pin is used to contact the electrode tab to perform a short-circuit test on the electrode tab.

[0031] An electrode assembly is obtained by using any one of the above methods during the processing and production of the electrode assembly.

[0032] The beneficial effects of the present invention:

[0033] 1. By setting a hot pressing component and a welding component, the present invention completes the hot pressing and welding of the electrode assembly using one device, and completes the short-circuit test and ultrasonic welding of the electrode tab within the process time of hot pressing, which can effectively shorten the production time, improve the efficiency, reduce the handling times during the production of the battery cell, and improve the yield of the battery cell.

[0034] 2. By arranging a probe in the upper pressing block and connecting the probe to a short-circuit tester, the present invention realizes the short-circuit test on the electrode assembly while hot pressing and welding, which can improve the yield of the battery cell and the detection efficiency of battery production. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of an electrode assembly processing device of the present invention;

[0036] Figure 2 It is a schematic structural diagram of the hot pressing component of the present invention;

[0037] Figure 3 This is a schematic structural view of the welding assembly of the present invention;

[0038] Figure 4 This is a schematic structural view of the upper pressing block of the present invention;

[0039] Figure 5 This is a schematic sectional structural view of the upper pressing block of the present invention.

[0040] 100, hot pressing assembly; 110, upper fixing plate; 120, upper support plate; 121, guide sleeve; 130, lower support plate; 140, electric cylinder; 141, telescopic rod; 150, guide post; 160, upper hot pressing plate; 161, heating rod; 170, lower hot pressing plate; 180, upper heat insulation plate; 190, lower heat insulation plate;

[0041] 200, welding assembly; 210, upper pressing block; 211, stepped through hole; 212, probe rod; 213, probe pin; 214, large-diameter section; 215, small-diameter section; 216, spring; 217, stepped surface; 218, waist-shaped hole; 220, lower pressing block; 230, welding head; 240, welding base; 250, welding machine; 251, telescopic shaft; 252, telescopic seat. Detailed implementation manners

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar symbols represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0043] As Figures 1-5 shown, the present invention discloses an electrode assembly processing device, including a hot pressing assembly 100 and two groups of welding assemblies 200.

[0044] Among them, the hot pressing assembly 100 is used to hot press the stacked or wound electrode assembly; the two groups of welding assemblies 200 are used to respectively fix and weld the positive and negative electrode tabs of the electrode assembly during the hot pressing process.

[0045] Therefore, with a single device, the hot pressing and welding operations of the electrode assembly can be completed. The entire device has a compact structure, and the ultrasonic welding of the electrode tabs of the electrode assembly can be completed within the process time of hot pressing, improving the efficiency, shortening the production time, reducing the handling times during the production of the battery cell, and improving the yield rate of the battery cell. Specifically:

[0046] Embodiment 1: As Figure 2 shown, the hot pressing assembly 100 includes an upper support plate 120, a lower support plate 130, an upper fixing plate 110, an electric cylinder 140, etc.

[0047] Among them, the lower support plate 130 is connected to the lower ends of four guide columns 150, the upper fixing plate 110 is connected to the upper ends of the four guide columns 150, and the lower support plate 130, the guide columns 150 and the upper fixing plate 110 together serve as the frame support for the operation of the hot pressing assembly 100.

[0048] The top surface of the upper fixing plate 110 is connected to the electric cylinder 140, and the telescopic rod 141 of the electric cylinder 140 passes through the through hole of the upper fixing plate 110 and is connected to the upper support plate 120.

[0049] The upper support plate 120 is connected with guide sleeves 121 corresponding to the guide columns 150. The guide sleeves 121 are sleeved on the guide columns 150. The top surface of the upper support plate 120 is connected with an electric cylinder 140, and the upper support plate 120 can slide up and down along the multiple guide columns 150 under the drive of the electric cylinder 140.

[0050] The bottom surface of the upper support plate 120 is connected with an upper heat insulation plate 180, which is used to cut off heat transfer. The bottom surface of the upper heat insulation plate 180 is connected with the upper hot pressing plate 160.

[0051] The flatness of the hot pressing plate 160 reaches grade 0. It can be made of NAK80 material, and the surface in contact with the electrode assembly is plated with heat-resistant non-metallic material. Heating rods 161 are installed in the upper hot pressing plate 160, preferably 2 - 5 pieces, with a power greater than 1.5KW, and are evenly distributed in the upper hot pressing plate 160.

[0052] Similarly, the top surface of the lower support plate 130 is connected with a lower heat insulation plate 190, which is used to cut off heat transfer. The bottom surface of the lower heat insulation plate 190 is connected with the lower hot pressing plate 170.

[0053] The flatness of the lower hot pressing plate 170 reaches grade 0, made of NAK80 material, and the surface in contact with the electrode assembly is plated with heat-resistant non-metallic material. Heating rods 161 are installed in the lower hot pressing plate 170, preferably 2 - 5 pieces, with a power greater than 1.5KW, and are evenly distributed in the lower hot pressing plate 170.

[0054] As Figure 3 shown, each set of welding assembly 200 includes a welding machine 250, an upper pressing block 210, a lower pressing block 220, a welding head 230, a welding seat 240, etc.

[0055] As Figure 4 and Figure 5As shown, the upper pressing block 210 is trapezoidal as a whole, and a stepped through hole 211 is provided vertically. The stepped through hole 211 is divided into a large-aperture section 214 and a small-aperture section 215. The large-aperture section 214 is located at the lower side and the small-aperture section 215 is located at the upper side. A spring 216 is installed in the large-aperture section 214. The upper part of the spring 216 is fixed at the stepped surface 217, and the lower part is connected to the probe pin 213. The probe rod 212 and the probe pin 213 are made of metal conductor material. The upper part of the probe rod 212 is connected to a wire, and the other end of the wire is connected to a short-circuit tester.

[0056] Waist-shaped holes 218 are opened on both sides of the center line of the large surface of the upper pressing block 210. Through the waist-shaped holes 218, the upper pressing block 210 can be fixed to the side surface of the upper hot pressing plate 160 or the upper heat insulation plate 180 by screws.

[0057] The lower pressing block 220 is also trapezoidal, and waist-shaped holes 218 are opened on both sides of the large surface. The lower pressing block 220 can be fixed to the side surface of the lower hot pressing plate 170 or the lower heat insulation plate 190 by screws. The upper pressing block 210 and the lower pressing block 220 can both be made of heat-resistant non-metallic materials.

[0058] There are two sets of welding heads 230, welding seats 240 and welding machines 250, one set for each of the positive and negative poles, which are respectively arranged on both sides of the hot pressing part.

[0059] Among them, as Figure 3 shown, the welding head 230 is connected to the telescopic seat 252, and the telescopic seat 252 is connected to the telescopic shaft 251. Through the telescopic seat 252, the welding head 230 can achieve vertical telescoping, and through the telescopic shaft 251, the welding head 230 can achieve horizontal telescoping.

[0060] During use, the upper hot pressing plate 160 and the lower hot pressing plate 170 jointly hot press the electrode assembly. The positive and negative pole tabs are in a compressed state between the upper pressing block 210 and the lower pressing block 220 respectively, and are placed on the welding seat 240. The welding machine 250 horizontally extends the welding head 230 by using the telescopic shaft 251, vertically extends the welding head 230 by using the telescopic seat 252, and ultrasonically welds the compressed pole tabs by using the welding head 230. After the welding machine 250 is completed, the welding head 230 retracts.

[0061] Furthermore, the parts of the lower surface of the welding head 230 and the upper surface of the welding seat 240 that contact the pole tabs can be flat teeth, shallow teeth or deep teeth. The shape of the welding teeth can be hemispherical, conical, wedge-shaped or trapezoidal, etc., and can be selected according to actual needs.

[0062] The welding seat 240 is connected to the lower support plate 130 through a connecting block. The welding machine 250 can adopt an ultrasonic welding machine, with a total of two, one for each of the positive and negative poles, and the power should be not less than 5.5KW to ensure the welding ability and effect.

[0063] Furthermore, the lower pressing block 220 and the welding seat 240 can also be integrally provided.

[0064] The present invention also discloses a method for hot pressing and tab welding of a lithium battery electrode assembly, including the steps:

[0065] S1. Preheat the lower hot pressing plate 170 and the upper hot pressing plate 160 to 90°C - 110°C, place the stacked or wound electrode assembly on the lower hot pressing plate 170, and the positive and negative tabs of the electrode assembly are respectively located above the two lower pressing blocks 220 on both sides;

[0066] S2. Use the electric cylinder 140 to control the descent of the upper hot pressing plate 160 to hot press the electrode assembly, and the upper hot pressing plate 160 and the lower hot pressing plate 170 continuously apply pressure until the pressure value reaches 5 - 10T and then maintain for 90 - 150S;

[0067] S3. The positive and negative tabs are respectively in a compressed state between the upper pressing block 210 and the lower pressing block 220 and are placed on the welding seat 240, and use the welding head 230 to perform ultrasonic welding on the tabs;

[0068] S4. After welding is completed and the hot pressing time reaches the process set value, the upper hot pressing plate 160 rises, completing the hot pressing and tab welding work of the electrode assembly, and sending it to the next process.

[0069] Furthermore, when the upper hot pressing plate 160 descends to hot press the electrode assembly, use the probe pin 213 to contact the tab to perform a short - circuit test on the tab.

[0070] The present invention also discloses an electrode assembly, which is obtained by using the above - mentioned method during processing and production.

[0071] By using the device and method of the present invention, the stacked or wound electrode assembly is sent to the hot pressing assembly 100 by a manipulator, and the lower hot pressing plate 170 and the upper hot pressing plate 160 jointly hot press the electrode assembly. The hot pressing process temperature can be controlled at 90°C - 110°C, the process - required pressure value can be controlled at 5 - 10T, and maintain for 90 - 150S; the hot pressing process can be better completed.

[0072] At the same time, the positive and negative tabs are respectively fixed by the upper pressing block 210 and the lower pressing block 220, so that the positive and negative tabs are respectively in a compressed and fixed state, which is convenient for ultrasonic welding by the welding machine 250.

[0073] A probe is also provided inside the upper pressing block 210. By using the probe pin 213 to contact the tab and the probe rod 212 is connected to a short - circuit tester, the electrode assembly can be subjected to a short - circuit test.

[0074] The whole device has a compact structure. By using a single device, the hot pressing, welding and testing operations of the electrode assembly can be completed. The tab ultrasonic welding of the electrode assembly is completed within the hot pressing process time, improving the efficiency, shortening the production time, reducing the handling times during the production of the battery cell, and improving the yield of the battery cell.

[0075] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

[0076] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention.

[0077] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0078] In the present invention, unless otherwise clearly specified and limited, the terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

Claims

1. An electrode assembly processing device, characterized in that, Comprising; A hot pressing assembly (100) for hot pressing the stacked or wound electrode assembly; Two sets of welding assemblies (200) for respectively fixing and welding the positive and negative electrode tabs of the electrode assembly during the hot pressing process; Each set of welding assemblies (200) includes an upper pressing block (210), a lower pressing block (220), a welding head (230) and a welding seat (240); Wherein, the upper pressing block (210) is connected to the side of the upper heat insulation plate (180), the lower pressing block (220) is connected to the side of the lower heat insulation plate (190), the upper pressing block (210) corresponds to the lower pressing block (220), and when the hot pressing assembly (100) hot presses the electrode assembly, the upper pressing block (210) and the lower pressing block (220) jointly squeeze and fix the electrode tab; The welding seat (240) is connected to the lower support plate (130), and the welding head (230) is connected to the welding machine (250); after the electrode tab is squeezed and fixed by the upper pressing block (210) and the lower pressing block (220), the electrode tab is placed on the welding seat (240), and the welding head (230) welds the electrode tab; The welding head (230) is connected to the telescopic seat (252), the telescopic seat (252) is connected to the telescopic shaft (251), and the telescopic shaft (251) is connected to the welding machine (250); Wherein, the welding machine (250) realizes the horizontal expansion and contraction of the telescopic seat (252) and the welding head (230) by using the telescopic shaft (251), and the welding machine (250) realizes the vertical expansion and contraction of the welding head (230) by using the telescopic seat (252); When the electrode tab is squeezed by the upper pressing block (210) and the lower pressing block (220), the welding head (230) is in a retracted state both horizontally and vertically; After the electrode tab is squeezed and fixed by the upper pressing block (210) and the lower pressing block (220), the electrode tab is placed on the welding seat (240), and the welding head (230) is in an extended state both horizontally and vertically to weld the electrode tab; The upper pressing block (210) is provided with a stepped through hole (211) in the vertical direction, a probe rod (212) is arranged in the stepped through hole (211), and a probe foot (213) is connected to the lower end of the probe rod (212); The large-diameter section (214) of the stepped through hole (211) is located at the lower side and the small-diameter section (215) is located at the upper side. A spring (216) is arranged in the large-diameter section (214), and the spring (216) is located between the stepped surface (217) and the probe foot (213) and sleeved on the probe rod (212).

2. The processing device for an electrode assembly according to claim 1, wherein The hot pressing assembly (100) includes an upper support plate (120), a lower support plate (130) and an electric cylinder (140); Wherein, the lower support plate (130) is connected with a plurality of guide columns (150), and the upper support plate (120) is connected with guide sleeves (121) corresponding to the guide columns (150); The top surface of the upper support plate (120) is connected with an electric cylinder (140), and the upper support plate (120) slides up and down along the plurality of guide columns (150) under the drive of the electric cylinder (140); The bottom surface of the upper support plate (120) is connected with an upper hot pressing plate (160), and the lower support plate (130) is connected with a lower hot pressing plate (170). Heating rods (161) are installed in both the upper hot pressing plate (160) and the lower hot pressing plate (170).

3. An electrode assembly processing device according to claim 2, characterized in that The hot pressing assembly (100) further includes an upper fixing plate (110). The upper fixing plate (110) is connected to the upper ends of a plurality of guide posts (150). The top surface of the upper fixing plate (110) is connected to an electric cylinder (140). The telescopic rod (141) of the electric cylinder (140) passes through the upper fixing plate (110) and is then connected to an upper support plate (120).

4. An electrode assembly processing device according to claim 3, characterized in that An upper heat insulation plate (180) is connected between the upper support plate (120) and the upper hot pressing plate (160), and a lower heat insulation plate (190) is connected between the lower support plate (130) and the lower hot pressing plate (170).

5. A method for processing an electrode assembly for the device according to any one of claims 1-4, characterized in that, Including the steps of: S1. Preheat the lower hot pressing plate (170) and the upper hot pressing plate (160) to 90°C - 110°C. Place the stacked or wound electrode assembly on the lower hot pressing plate (170). The positive and negative electrode tabs of the electrode assembly are respectively located above the two lower pressing blocks (220). S2. Use the electric cylinder (140) to control the descent of the upper hot pressing plate (160) to hot press the electrode assembly. The upper hot pressing plate (160) and the lower hot pressing plate (170) continuously apply pressure until the pressure value reaches 5 - 10T and then maintain for 90 - 150S. S3. The positive and negative electrode tabs are in a compressed state between the upper pressing block (210) and the lower pressing block (220), and are placed on the welding seat (240). Use the welding head (230) to perform ultrasonic welding on the electrode tabs. S4. After the welding is completed and the hot pressing time reaches the process setting value, the upper hot pressing plate (160) rises, completing the hot pressing of the electrode assembly and the welding of the electrode tabs, and sending it to the next process.

6. The method for processing an electrode assembly according to claim 5, wherein, When the upper hot pressing plate (160) descends to hot press the electrode assembly in S2, the probe pin (213) is used to contact the electrode tab to perform a short - circuit test on the electrode tab.

7. An electrode assembly, characterized in that, When the electrode assembly is processed and produced, it is produced by the method of claim 5 or 6.

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